Heteroclinus tristis, known commonly as the Sharp-nose weedfish in Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

, is a species of clinid

Clinid

Clinids are blennioids; perciform marine fish of the family Clinidae. Temperate blennies, the family ranges from the Atlantic, Pacific and Indian Oceans, in both the Southern and Northern Hemisphere...

 in the genus Heteroclinus

Heteroclinus

Heteroclinus is a genus of clinids found in the western Indo-Pacific.-Species:* Adelaide's weedfish, Heteroclinus adelaidae * Natal weedfish, Heteroclinus antinectes...

. It is a subtropical blenny found around southern Australia, in the western Pacific

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

 and Indian Ocean

Indian Ocean

The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...

. It was named by C.B. Klunzinger in 1872, originally under the name Cristiceps tristis, and can reach a maximum length of 30 centimetres. Blennies in this species feed primarily off of bony fish, shrimp

Shrimp

Shrimp are swimming, decapod crustaceans classified in the infraorder Caridea, found widely around the world in both fresh and salt water. Adult shrimp are filter feeding benthic animals living close to the bottom. They can live in schools and can swim rapidly backwards. Shrimp are an important...

 and prawns.